Jack



D. E. HANEY March 14, 1939.

JACK

2 Sheets-Shem- 1 Filed Sept. 17, 1938 Inventor 19m Attorneys March 14, 1939. D. E. HANEY 2,150,831

I JACK Filed Sept. 17, 1938 2 Sheets-Sheet 2 ulll llllllllllllllll lllllll lllllll lllllllllll Illl Illlllll llllllllllll Inventor By Md Q w 5% A iiomeys Patented Mar. 14, 1939 UNITED STATES PATENT OFFICE 4 Claims.

This invention appertains to new and useful improvements in lifting jacks.

The principal object of this invention is to provide a jack in which a manually operative member is employed constructed and arranged with the rest of the mechanism in such manner that motion thereof in either direction will act as propulsion for the jack.

These and various other important objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawings:

Figure 1 represents a top plan view.

Figure 2 is a section on the line 2-2 of Figure 1.

Figure 3 is a sectional view substantially on the line 33 of Figure 1.

Figure 4 is a sectional view through one of the gears and screws.

Figure 5 is a side elevational view of one of the large gears.

Figure 6 is a side elevational view of the other large gear.

Figure 7 is a side elevational view of the operating member.

Figure 8 is a perspective view of one of the pawl holders.

Referring to the drawings wherein like numerals designate like parts, it can be seen that numeral 5 represents the pedestal having the laterally disposed base members 6. The numeral 1 represents the horizontal beam which has a downwardly disposed intermediate portion 8 bifurcated as at 9 to receive the upper end of the pedestal 5 and through this is disposed the pivot pin I0. Each end of the beam 1 is provided with a raised portion H upon which the corresponding gear l2 or [3 rests. The gear l2 has its teeth [4 on the upper half portion of its periphery, while the gear l3 has its teeth I 5 on the lower half of its periphery.

Disposed through an opening I 6 in each end portion of the beam 1 is a screw shaft H and a key in each of these openings I6 denoted by numeral l8 fits in the corresponding groove IQ of the corresponding screw shaft ll. These shafts I l are threadedly disposed through the gears l2 and I3 and are provided with yokes 20 at their upper ends pivotally secured as at 2| to the connecting bar 22 which is provided with a pair of laterally disposed ears 23 between which the L-shaped riser 24 is pivotally mounted as at 25. This riser can either be thrown to the dotted line position shown in Figure 3 when not desired or thrown to a position resting upon the bar 22 when the height of the bar 22 is to be increased.

Numerals 26 and 2'! represent the ratchet wheels which are rotatably mounted on the pin 28 which is threadedly disposed into the body 8 as at 29.

Numeral 33 represents the operating member .5 which has a bar receiving socket 3! in one end and its other end trifurcated to form the three fingers 32, 33 and 34 which have registering openings 35 for the reception of the pin 28, these fingers incidentally serving as spacers for the ratchet wheels 26 and 27'.

Ratchet pawls 3B and 3'! are employed and are mounted in the spaces between the trifurcations, the same being pivotally mounted as at 38 and each provided with a point a at its opposite ends.

T-shaped retainers 39 and 40 are provided for these pawls, the same each having at each end of its head portion a lug M from which a spring 42 extends to the corresponding end of the corresponding pawl 36. These holders 39 and 40 are pivotally secured as at 43 to the holder 30. The holder is preferably of sheet spring material and has a boss 44 which is engageable into the recesses 45 on opposite sides of the holder.

Obviously when these holders 39 and 40 are swung the bosses 44 engage into the recesses 45 the pawls 36 and 37 are held in neutral position and do not engage the ratchet wheels thus permitting the apparatus to be adjusted rapidly to the desired position where ratchet adjustment is to start.

When the holders 39 are swung to the position shown in. Figure 1 the pawls are released into position whereby one pawl will grip when the member 30 is moving in one direction and the 3 other pawl will grip to operate its corresponding ratchet wheel when the member 30 is operated in the opposite direction and in carrying this out, it will be observed that the ratchet wheel 26 meshes with the teeth of the gear I 2 While the ratchet wheel 21' meshes with the teeth of the gear l3.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

1. A jack structure comprising a base, a horizontal beam, means supporting the beam on the base, a lifting bar, screw shafts extending from the ends of the bar and slidab ly disposed through the ends of the beam, a sliding connection be- 55 operating member, a pair of pawls on the operating member, and means whereby one pawl will operate on one of the ratchet wheels when the operating member is swung in one direction and the other pawl will operate on the other ratchet wheel when the operating member is swung in the opposite direction.

2. A jack structure comprising a base, a horizontal beam, means supporting the beam on the base, a lifting bar, screw shafts extending from the ends of the bar and slidably disposed through the ends of the beam, a sliding connection between each end of the beam and the corresponding screw shaft, gears through which the screw shafts are threadedly disposed, a ratchet wheel engaged with each of the gears, a swingableropcrating member, a pair of pawls on the operating member, and means whereby one pawl will operate on one of the ratchet wheels when the operating member is swung in'one direction and. the other pawl will operate on the other ratchet wheel when the operating member is swung in the opposite direction, and a swingable riser mounted on the lifting bar.

3. A jack structure comprising a base, a horizontal beam, means supporting the beam. on the base, a lifting bar, screw shafts extending from the ends of the bar and slidably disposed through the ends of the beam, a sliding connection between each end of the beam and the corresponding screw shaft, gears through which the screw shafts are threadedly disposed, a ratchet wheel engaged with each of the gears, a swingable operating member, a pair of pawls on the operating member, and means whereby one pawl will operate on one of the ratchet wheels when the operating member is swung in one direction and the other pawl will operate on the other ratchet wheel when the operating member is swung in the opposite direction, said operating member being slotted at one end to provide fingers, said fingers serving as spaces for-the ratchetwheels.

4. A jack structure comprising a base, a horizontal beam, means supporting the beam on the member, and means whereby one pawl will operate on one of the ratchet wheels when the operating member is swung in one direction and the other pawl will operate on the other ratchet wheel when the operating member is swung in the opposite direction, said means associated with the pawls including holding means whereby the pawls can be held in neutral position and disengaged from the ratchet wheels. V

DAVID EVERETT HANEY. 

